Sharpie Liquid Pencil Turns Permanent Only After 3 Days

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Sharpie is reinventing the pen with a pencil. The “Liquid Pencil” writes as smooth as a pen and is fully erasable like a pencil for up to 3 days. Then the magic happens. The ink is made from a liquid graphite that turns permanent like a marker after 72 hours (or 24 hours ...

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